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銆�銆�R = 蟻L/S锛埼╋級
銆�銆�鍏朵腑锛歀-閲戝爆灏庣窔闀峰害 S-閲戝爆灏庣窔姗埅闈㈢⿳ 蟻-闆诲皫鐜囷紙涓嶅悓鏉愭枡闆婚樆鐜囦笉鍚岋級
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銆�銆�螖R = 螖蟻L/S + 螖L蟻/S ?C螖S蟻L/S2 锛�2-2锛� 鐢ㄥ紡锛�2-1锛夊幓闄ゅ紡锛�2-2锛夊緱鍒�
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銆�銆�螖S/S = 2螖r/r 锛�2-4锛�
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